Just wondering... do chickens get flaky skin? My three girls who are about 4 and 1/2 months (they just started laying) have, well, what seem to be like big dandruff flakes, on their backs. Every time they ruffle their feathers and shake they get flakes on top of the shoulder/back... Is this normal? Is there something I should be doing different? Do they have mites of some kind? They all act normal, nothing else is unusual.